Thermostatic-indicator-securing means



oct. 9, 192s. 1,687,104

C. H. MORROW Y TaEnuosTA'rIc :NmcAToR SEQURING MEANS F-iied Agg. 26,1926 Patented @et 9, 1928.

Unirse I STATES' CLARENCE H. MORROW, OF*CLEVELAINE,.CHIC` .SSIGNOR TOTHE HQTSTREAM HEATER COIVIIEAIIY,` OIF CLEVELAI'E'D, GEIQ. A CEEORATIONOF OHIO.v

THERMOSTATIC-NDCATOB-SECURING MEANS.

Application filed August 26. 192e. Serial No. 131,805.

This invention relates to means for adjustthermostatic gas regulatorsand has especial reference to the provision of means for adjustment ofthe indicator of such a regulator during the calibration thereof,whereby subsequent corrections in calibrations including re-adj ustmentmay be effected without the difhculties heretofore encountered.

The exact nature of the invention is difficult of description in fewwords but will be evident from the following description taken inconnection with the accompanying drawings in which Fig. l is a side viewof a regu.- lator such as described, with my invention incorporatedtherein;- Fig.l 2 is a section as along line .2e-Q, Fig. l showingr theindicator or regulator adjusted to a different setting from that of l;and Fig. 3 is a view similar to that of Fig` l butpartly in section toshow the construction and relation of the parts.

The regulator comprises a head l provided with inlet and outlet openings2 and 3 and enclosing spring` seated valve the details of which areimmaterial here and consequent-ly not shown. Extending from the head area pair of thermostatic elements l and 5, theouter element i being`secured to a shank portion preferably integral with the head andprovided with screw t-hreads whereby the regulator maj7 be attached to achamber such as a water tank to be thermally responsive to the contentsthereof. The inner thermostatic element 5 is of course adapted forexpansion greater than that of the outer element 4 responsive totemperature rise,.to lift the valve within the head l from its seat-Longitudinal adjustment between the inner member andthe valve isaccomplished by a threaded engagement between the stem 6 of the valveand a short metallic rod 7 in fixed relation with the thermostaticmember 5.

Upon the head l is a -graduated scale 8 and secured upon the cylindersurface of the member 7 by means of a set screw 9 is an indicator l0carrying a finger 1l adapted for 'movement over the scale 8 toselectively tix the relation between the thermostat and the valvewhereby the desired temperature regulation of the'liame controlled bythe valve may be eected.

What has thus far been described is old in the art; and it is desirableand common to quite accurately calibrate the thermostat,that is to .tixthe angular relation between the indicator l() and the rod 7 so that bymovement of the finger Il to the proper calibration upon the scale, theactual temperature maintained by the thermostat will be that indicatedupon the scale. It is occasionallyfnecessary however, to vrecalibratethe thermostat which of course involves readjustment of the indicatorl() upon the rod 7. In order to prevent accidental movement between theindicator 10 andthe rod 7 upon whichit is mounted, and

the desired rotation of the indicator.

In order to overcome this diliiculty, I provide uponr the rod 7 in thedesired plane of the screw an annular groove l2 in which the set screwwill obviously bottom when tightened.

It will be obvious that by the employment of this construction when theset screw is released any deformation within the groove 12 will beimmaterial as effecting a smooth rotation through any desired angle ofthe indicator upon the rod 7.

I I/Vhat I claim is: e 1. In an Larticle of the class described, avalve, a thermally responsive element, a cylindrical rod secured withsaid element and in threaded relation with the stem of saidvalve, anindicator for adjustment and indication of said relation, and means foradjustably securing said indicator from movement upon said rod, saidmeans comprising an annular groove in said rod and a member threaded insaid indicator and adapted to be turned therein toengage the bottom ofsaid groove.

2. In an article of the class described, a

head, a valve therein, a thermallyresponsive i element, a cylindricalrod secured with said element and in threaded relation with the stem ofsaid valve, an indicator for adjustment of said relation, a scale uponsaid head, a linger on said indicator adapted to indicate on said scalethe adjustment of said relation, an annular groove on said rod, a memberthreaded in said indicator' and projecting,` into said groove tolongitudinally position said indicator on said rod, said groove being located on lsaid rod to position said finger over Ysaid scale,`said memberbeingadapted to engage the bottom of said groove toradju'stably securesaid indicator from angular movement v on said rod. f

n testimony whereof I hereby' affix my signature.

CLARENCE H. MoRRoW. j

